In 1728 he accompanied Count Sinzendorf to France, where he made the acquaintance of Montfaucon, Martène Durand, Le Texier, Calmet etc., and enriched his collection from the libraries of the order.
In the Abbey of St. Vanne near Verdun a reform was initiated by Dom Didier de la Cour, which spread to other houses in Lorraine, and in 1604 the reformed Congregation of St. Vanne was established, the most distinguished members of which were Ceillier and Calmet.
Following Hontheim, Calmet and others, the Bollandists, with Marx, Aloys Lütolf, and other historians refer these bishops of Trier to a period following 250, though not all of them consider this as fully established.